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package com.oracle.graal.python.nodes.bytecode;

import com.oracle.graal.python.PythonLanguage;
import com.oracle.graal.python.builtins.objects.dict.DictNodes;
import com.oracle.graal.python.builtins.objects.dict.PDict;
import com.oracle.graal.python.lib.PyDictDelItem;
import com.oracle.graal.python.nodes.PNodeWithContext;
import com.oracle.graal.python.runtime.object.PFactory;
import com.oracle.truffle.api.CompilerAsserts;
import com.oracle.truffle.api.bytecode.OperationProxy;
import com.oracle.truffle.api.dsl.Bind;
import com.oracle.truffle.api.dsl.Cached;
import com.oracle.truffle.api.dsl.Cached.Shared;
import com.oracle.truffle.api.dsl.GenerateInline;
import com.oracle.truffle.api.dsl.NeverDefault;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.frame.Frame;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.nodes.ExplodeLoop;
import com.oracle.truffle.api.nodes.Node;

@GenerateInline(false) // used in BCI root node
@OperationProxy.Proxyable
public abstract class CopyDictWithoutKeysNode extends PNodeWithContext {
    public abstract PDict execute(Frame frame, Object subject, Object[] keys);

    @Specialization(guards = {"keys.length == keysLength", "keysLength <= 32"}, limit = "1")
    public static PDict copy(VirtualFrame frame, Object subject, @NeverDefault @SuppressWarnings("unused") Object[] keys,
                    @Bind Node inliningTarget,
                    @Cached("keys.length") int keysLength,
                    @Bind PythonLanguage language,
                    @Shared @Cached DictNodes.UpdateNode updateNode,
                    @Shared @Cached PyDictDelItem delItem) {
        PDict rest = PFactory.createDict(language);
        updateNode.execute(frame, rest, subject);
        deleteKeys(frame, inliningTarget, keys, keysLength, delItem, rest);
        return rest;
    }

    @ExplodeLoop
    private static void deleteKeys(VirtualFrame frame, Node inliningTarget, Object[] keys, int keysLen, PyDictDelItem delItem, PDict rest) {
        CompilerAsserts.partialEvaluationConstant(keysLen);
        for (int i = 0; i < keysLen; i++) {
            delItem.execute(frame, inliningTarget, rest, keys[i]);
        }
    }

    @Specialization(guards = "keys.length > 32")
    public static PDict copy(VirtualFrame frame, Object subject, Object[] keys,
                    @Bind Node inliningTarget,
                    @Bind PythonLanguage language,
                    @Shared @Cached DictNodes.UpdateNode updateNode,
                    @Shared @Cached PyDictDelItem delItem) {
        PDict rest = PFactory.createDict(language);
        updateNode.execute(frame, rest, subject);
        for (int i = 0; i < keys.length; i++) {
            delItem.execute(frame, inliningTarget, rest, keys[i]);
        }
        return rest;
    }

    public static CopyDictWithoutKeysNode create() {
        return CopyDictWithoutKeysNodeGen.create();
    }

}
